Model 451B电离室巡检仪

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Model 451B电离室巡检仪


The Fluke 481 Radiation Detection Meter is a portable and practical means for discovering irradiated goods, and for helping remediate contaminant and safety issues while minimally affecting performances. Ideal for detecting irradiated goods, equipment, surfaces or environments in industrial settings, the 481 Radiation Meter helps ascertain worker safety and compliance to federal regulations.

Use of the Fluke 481 assures employees that radiation dangers are known, monitored and calculated for their security. Whenever radiation is found, a clear and quantifiable result provides handlers to comply with federal guidelines while avoiding unnecessary steps that could stop procedures, impact productivity or lead to missed revenue.


  • Detects skin-dose (beta particle) and deep-dose (gamma) and X-ray radioactivity



  • Requires no adjustments; simple two button process



  • Provides promptly read, correct value through autoranging capability



  • Easily visible inside truck trailers and other low-light situations with automated backlight



  • Works dependably inside or outside thanks to sealed case



  • 30 % more precise than other available meters



  • Delivers more than one week of uninterrupted functioning with two 9-volt alkaline batteries



  • Proven in use by state and local governmental emergency response professionals, state inspectors, HAZMAT teams and nuclear power workers



  • Measures both dose and dose-rate



  • Valuable for contamination-detection, general radiation area metering, radiation-level monitoring, and hazardous materials assessment



  • Rugged Fluke design



General specifications
Radiation detected Beta > 100 keV
Gamma > 7 keV
Operating ranges 0 mR/h to 5 mR/h (8 sec)
0 mR/h to 50 mR/h (2.5 sec)
0 mR/h to 500 mR/h (2 sec)
0 R/h to 5 R/h (2 sec)
0 R/h to 50 R/h (2 sec)
Accuracy Within 10 % of readings between 10 % and 100 % of full scale indication on any range, exclusive of energy response
Detector Chamber (cc volume air ionization) 349 cc
Chamber wall (phenolic) 246 mg/cm2
Chamber window (mylar) 6.6 mg/cm2
Beta slide 440 mg/cm2
Automatic features Auto-zeroing, auto-ranging, and auto-backlight
Power requirements Two 9 V alkaline, 200 hours operation
Warm-up time One minute
Battery life Four+ hours continuous use per battery pack (assumes 50 % brightness of LCD)
Dimensions (W x D x H) 10 cm x 20 cm x 15 cm (4 in x 8 in x 6 in)
Weight 1.11 kg (2.5 lb)


Display LCD analog/digital with backlight
Analog 100 element bar graph 6.4 cm long. Bar graph is divided into 5 major segments, each labeled with the appropriate value for the range of the instrument
Digital 2.5 digit display is followed by a significant zero digit depending on the operating range of the instrument. The units of measurement are indicated on the display at all times. Digits are 6.4 mm (0.25 in) high. Low battery and freeze indicators are also provided on the display
Integrate mode Operates continuously 30 seconds after the instrument has been turned on. Integration is performed even if the instrument is displaying in mR/h or R/h
Freeze mode Will place a tick mark on the bar graph display to hold on the peak displayed value. The unit will continue to read and display current radiation values


Temperature range -4 °F to 122 °F
Relative humidity 0 % to 100 % (at 140 °F)
Geotropism < 1 %





型号名称 描述
FLUKE-481 481 Ion Chamber Survey Meter
FLUKE-481-DESI 481-DESI Ion Chamber Survey Meter, dose equivalent SI


450UCS Check Source, 238Uranium, 0.064 µCi, impregnated 2 in x 2 in yellow card

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